The Last Of Us (ElliexOC): Wild Hearts

Nyx is a 16 year old girl, who lost her parents during the apocalypse at a young age. She only had distant memories of them. After being taken in by Marlene, the leader of the fireflies, and Anna, the nurse of the fireflies, Nyx and Anna had a mother-daughter relationship . However, Nyx has a secret that only the fireflies know. She's a cure for mankind. A new group joins Marlene's group and in hopes of building a bright and safe future. Ellie and meets Nyx, who is also a cure for mankind, but somehow Nyx is very fond with Ellie after realizing that she isn't anything like those other people who kill. She and Ellie become inseparable and both hopes to survive this together. After meeting Joel, who changes their point of view about the past, and takes them across America to deliver them to the fireflies trying to find the cure.